If trying to source original sports suspension for my Passat is anything to go by, there are a multitude of spring, damper, bushing combinations. Each one different according to the model, spec and extras fitted to the car.
If you have got body roll, it won't be that the transit blocks are still in. I think the most simple solution would be a set of decent aftermarket springs. H&R or Eibachs with a 25mm or so drop ought to do the job and still work well with the original dampers.